Day had hoped to make a strong return to Augusta this year after a number of back injuries, but hit seven bogeys and two birdies for a five-over 77 in the first round.
The 33-year-old did not mince his words when he was asked about how his first round performance went.
“I mean, it’s just frustrating,” he said.
“I did absolutely nothing right today, which is unfortunate, so I’ve got to go back to the range, work on some stuff. Go to the putting green, work on that as well.”
Day admitted that his injury problems had also taken a toll on him mentally on the comeback trail.
“I tell you what, it’s severely frustrating over the last year-and-a-half, two years,” he said.
“Sometimes I get discouraged out there but, it is what it is. I’ve just got to try and focus on trying to stay patient.”
The 2015 PGA Championship winner started the day in positive fashion, operating at one-under through the first six holes before his game unravelled.
He was far from the only Australian to blow a fast start, with Marc Leishman also suffering a similar fate in the first round.
Leishman made an incredible start to the opening round, with four birdies inside the first six holes, before adding four bogeys between the ninth and 14th holes to finish an even-par 72.
Cameron Smith, the 2020 Masters runner-up, had a slow start, finding himself four-over through nine holes before making a charge on the back nine to finish at a two-over 74.